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The good news about breast cancer is that fewer women are dying from it. At first, experts thought this decrease was because regular screening mammograms found cancers at early, more-curable stages. But new studies have raised questions about mammography. Perhaps the lower death rate from breast cancer is due to better treatments for the disease rather than the ability of mammograms to find it early.
A recent Canadian study in women aged 40 to 59 is the latest to question the usefulness of mammograms. Some study participants had annual mammograms and some did not. Over the course of 25 years, about the same number of women in each group developed breast cancer, and about the same number in each group died from these cancers; so for preventin…